Physics Unit 7 - Light and Optics (Practice Test)

Unlike mechanical waves, electromagnetic waves can travel through:

• a vacuum

• water

• the ground

• air

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An object appears red because it:

• reflects light waves of all colors

• reflects red light waves

• absorbs red light waves

• transmits light waves of all colors

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Which electromagnetic wave carries the most energy?

• gamma waves
• microwaves
• radio waves
• light waves

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The speed of light in a vacuum is:

• represented by the symbol "c"

• 3.00 × 10⁸ m/s

• constant

• all answers are correct

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Why is light refracted?

• Light speeds up
• Light slows down
• Light speed stays the same
• Light can either slow down or speed up

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When all three primary light colors are mixed, which color is produced?

• black

• magenta

• white

• cyan

Light is considered to be

• electromagnetic waves
• particles
• transverse waves
• all of the above

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What are the three primary colors of light?

• Red, Yellow, Blue

• Red, Green, Yellow

• Red, Green, Blue

• Yellow, Blue, Green

What does it mean to polarize light?

• Blocks light

• Causes light to travel in only one plane

• Reduces the amount of light

• Looks cool

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Which of the following statements is true about a green grape?

• It absorbs green light.

• It absorbs white light.

• It reflects green light.

• It reflects white light.